Consulta: subjectFacets:"Hummingbird"
Registros recuperados: 5
Data/hora: 02/06/2024 13:31:06

Reproductive biology of the protandrous Ferdinandusa speciosa Pohl (Rubiaceae) in Southeastern Brazil
Provedor de dados: Revista Brasileira de Botânica
Autores: CASTRO,CIBELE CARDOSO DE; OLIVEIRA,PAULO EUGÊNIO ALVES MACEDO DE.
A study of the floral biology and the breeding system of Ferdinandusa speciosa Pohl (Rubiaceae) was carried out from March to September 1996 in Uberlândia, MG, central Brazil. This species is a shrub or small tree that occurs in swampy edges of gallery forests. The two studied populations flowered somewhat asynchronously from March to July. The tubular flowers are red, approximately 4.7 cm long and last for two days. They are protandrous and the pollen is available one day before the stigma becomes receptive. The beginning of anthesis and the opening of the stigmatic lips occur at dusk. The nectar is secreted during both the male and the female phases, with concentration of sugars greater in the male phase. The flowers are pollinated by two hummingbird...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ferdinandusa; Hummingbird; Pollination; Protandry; Rubiaceae.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000200006

The rate of visitation by Amazilia fimbriata (Apodiformes: Trochilidae) influences seed production in Tillandsia stricta (Bromeliaceae)
Provedor de dados: Revista Brasileira de Zoologia
Autores: Missagia,Caio C.C.; Alves,Maria Alice S.
Legitimate flowers visitors pollinate the flower during the visit and thus influence the production of fruits and seeds. We tested whether the visitation rate of potential pollinators is associated with the amount of seeds per fruit produced by the self-compatible bromeliad Tillandsia stricta (Bromeliaceae). We determined whether hummingbirds are legitimate visitors by testing for a correlation between visits and pollination (seed production) at the Guapiaçú Ecological Reserve (Reserva Ecológica de Guapiaçú), state of Rio de Janeiro. We tested 30 flowers, five of which were also monitored to test the possibility of spontaneous self-pollination. The remaining 25 flowers were exposed to floral visitors. Twenty-two flowers formed fruits and seeds, from which...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Atlantic forest; Hummingbird; Pollination; Self-compatibility.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000300260

Evaporative water loss and dehydration during the night in hummingbirds
Provedor de dados: Revista Chilena de Historia Natural
Autores: HARTMAN BAKKEN,BRADLEY; SABAT,PABLO.
Nectar-feeding birds oscillate between avoiding overhydration when they are feeding and preventing dehydration during fasts. Here, we examined how resting rates of total evaporative water loss (TEWL) and metabolic water production (MWP) influence water balance in the green-backed firecrown (Sephanoides sephanoides), a Chilean hummingbird. We hypothesized that a circadian rhythm in TEWL would assuage the dehydration risk that hummingbirds face during the night. However, we did not find support for this idea. In resting hummingbirds, rates of TEWL during the day (54 ±6 µLh-1,n = 8) and night (65 ± 12 h-1, n = 5) were similar. Rates of MWP were also similar between the day (22 ±3 µL h-1, n = 8) and night (23 ± 2 µL h-1, n = 5). MWP rates were significantly...
Tipo: Journal article
Palavras-chave: Circadian rhythm; Evaporative water loss; Hummingbird; Osmoregulation; Water balance.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300001

Reproductive biology of Amasonia obovata Gleason (Laminaceae)
Provedor de dados: Acta Amazonica
Autores: Schvinn,Thays de Assis; Miranda,Anderson Fernandes de; Silva,Celice Alexandre.
Floral mechanisms that ensure seed production via autogamy are more likely to occur in species growing in environments where pollination is scarce. Amasonia obovata was studied in the State of Mato Grosso-Brazil, from 2009 to 2012, to analyze the morphological and reproductive characteristics, aside from investigating the association of the reproductive success with the pollinator frequency and identity. The flowering and fruiting of A. obovata was concentrated in a period of five months during the rainy season. The dichogamy in flowers of A. obovata is not clearly defined, since the sexual functions were overlapped in the male and female phases. The species is self-compatible and not apomictic. The fruiting percentage obtained by hand self-pollination did...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Autogamy; Floral morphology; Flowering phenology; Hummingbird.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400004

Nesting behavior of the swallow-tailed hummingbird, Eupetomena macroura (Trochilidae, aves)
Provedor de dados: Brazilian Journal of Biology
Autores: ONIKI,Y.; WILLIS,E. O.
An August or winter nestling of Eupetomena macroura was fed only every 40-50 min for at least 24 days in the nest, with fewer feedings at midday. As in other hummingbirds, it was brooded only the first week or two, and left alone even on cool nights after 12 days, probably due to the small nest size. The female attacked birds of many non-nectarivore species near the nest, in part probably to avoid predation. Botfly parasitism was extremely high, as in some other forest-edge birds.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nesting; Hummingbird; Eupetomena macroura; Parasitism; Predation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400016